hang some blankets up or something man. not sure how your room's set up.
go cop some rope. put some hooks up. and then just run the rope from the hooks and hang the blankets or whatever up to kill that echo. And if when you put the hooks in the wall make sure it's in a stud. Cause, otherwise your gonna get a big as hole in your wall. Once you add the weight of the blankets.
and look out for electrical wiring.